JPS5758436A - Main oscillating system of pilot multiplying type carrier current - Google Patents

Main oscillating system of pilot multiplying type carrier current

Info

Publication number
JPS5758436A
JPS5758436A JP55133000A JP13300080A JPS5758436A JP S5758436 A JPS5758436 A JP S5758436A JP 55133000 A JP55133000 A JP 55133000A JP 13300080 A JP13300080 A JP 13300080A JP S5758436 A JPS5758436 A JP S5758436A
Authority
JP
Japan
Prior art keywords
pilot
circuit
frequency
multiplying
main oscillation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP55133000A
Other languages
Japanese (ja)
Inventor
Shoichi Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55133000A priority Critical patent/JPS5758436A/en
Publication of JPS5758436A publication Critical patent/JPS5758436A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/08—Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To economize the system, by multiplying the frequency of transmission synchronizing pilot received from a master station in a slave station and froming the same output frequency as the main oscillation circuit. CONSTITUTION:A transmission synchronizing pilot transmitted from a master station is received at a pilot extracting circuit 2 via a hybrid circuit 1 from a transmission line 8 together with other information signals. The pilot is extracted at the circuit 2 and is given to a pilot multiplying circuit 3, a pilot level monitoring circuit 4 and an automatic frequency controlling circuit 5. In the pilot multiplying circuit 3, the frequency of the received transmission synchronizing pilot is multiplied into the same frequency as the frequency of the main oscillation circuit and outputted as the main oscillation current now in use. The oscillating frequency of a main oscillation circuit 6 for spare carrier current is controlled through the collation with the transmission synchronizing pilot frequency obtained from the pilot extracting circuit 2 normally and if the pilot signal is interrupted, the output of the oscillation circuit 6 is selected.
JP55133000A 1980-09-26 1980-09-26 Main oscillating system of pilot multiplying type carrier current Pending JPS5758436A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55133000A JPS5758436A (en) 1980-09-26 1980-09-26 Main oscillating system of pilot multiplying type carrier current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55133000A JPS5758436A (en) 1980-09-26 1980-09-26 Main oscillating system of pilot multiplying type carrier current

Publications (1)

Publication Number Publication Date
JPS5758436A true JPS5758436A (en) 1982-04-08

Family

ID=15094438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55133000A Pending JPS5758436A (en) 1980-09-26 1980-09-26 Main oscillating system of pilot multiplying type carrier current

Country Status (1)

Country Link
JP (1) JPS5758436A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62277828A (en) * 1986-05-27 1987-12-02 Mitsubishi Electric Corp Optical transmission equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62277828A (en) * 1986-05-27 1987-12-02 Mitsubishi Electric Corp Optical transmission equipment

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